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From: Christoph Lameter <clameter@sgi.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: SLUB: The unqueued Slab allocator
Date: Thu, 22 Feb 2007 10:42:23 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0702221040140.2011@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <p73hctecc3l.fsf@bingen.suse.de>

On Thu, 22 Feb 2007, Andi Kleen wrote:

> >    SLUB does not need a cache reaper for UP systems.
> 
> This means constructors/destructors are becomming worthless? 
> Can you describe your rationale why you think they don't make
> sense on UP?

Cache reaping has nothing to do with constructors and destructors. SLUB 
fully supports constructors and destructors.

> > G. Slab merging
> > 
> >    We often have slab caches with similar parameters. SLUB detects those
> >    on bootup and merges them into the corresponding general caches. This
> >    leads to more effective memory use.
> 
> Did you do any tests on what that does to long term memory fragmentation?
> It is against the "object of same type have similar livetime and should
> be clustered together" theory at least.

I have done no tests in that regard and we would have to assess the impact 
that the merging has to overall system behavior.


  reply	other threads:[~2007-02-22 18:42 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-22  7:00 Christoph Lameter
2007-02-22  8:34 ` Peter Zijlstra
2007-02-22 15:25   ` Christoph Lameter
2007-02-22  8:58 ` David Miller
2007-02-22 15:26   ` Christoph Lameter
2007-02-22 10:49 ` Pekka Enberg
2007-02-22 15:15   ` Christoph Lameter
2007-02-22 17:54 ` Andi Kleen
2007-02-22 18:42   ` Christoph Lameter [this message]
2007-02-23  0:16     ` Andi Kleen
2007-02-23  4:55       ` Christoph Lameter
2007-02-24  5:28     ` KAMEZAWA Hiroyuki
2007-02-24  5:47       ` Christoph Lameter
2007-02-24  5:54         ` David Miller
2007-02-24 17:32           ` Christoph Lameter
2007-02-24 19:33             ` Jörn Engel
2007-02-25  0:14               ` Christoph Lameter
2007-02-25 12:23                 ` Jörn Engel
2007-02-25  0:53             ` David Miller

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